用碱石灰烧结法生产Al_2O_3过程中,由铝土矿、石灰石和燃料等带入的黄铁矿及其他硫的化合物,在烧结时转变为Na_2SO_4,造成碱消耗量的增加和一些生产操作的困难。例如,熟料窑中的“结圈”等。在入窑生料中加入一定数量的还原剂,可以将Na_2SO_4还原为硫化物,并主要以FeS的形式与赤泥一起排走。这个方法从1961年起应用于我国的磁石灰烧结法及Bayer-烧结联合法生产,效果良好。本文提出了部分有关的工厂实践结果和试验数据以及讨论意见。
Sodium sulphate is formed from pyrite and other sulphur compounds in theraw materials, such as bauxite and limestone, and in fuels, such as coal and fueloil employed during sintering, causing higher soda losses of the process and givingtrouble to a number of operations, for instance, the ring-formation in the ro-tary kilns. The addition of anthracite, as a reducing agent to the raw mix for thekiln-feed, will reduce most of the sulphate into ferrous sulphide, which wouldeventually be removed from the process with red mud. This method has been suc-cessfully employed in alumina plants of soda-lime sintering process and Bayersintering combination process in China since 1961. Plant operating results as wellas experimental data, together with brief discussion are presented.
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